<template>
  <div>

    <!-- 顶部滑动条区域 -->
    <div id="slider" class="mui-slider">
				<div id="sliderSegmentedControl" class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted">
					<div class="mui-scroll">
						<a :class="['mui-control-item', item.id == 0 ? 'mui-active' : '']" v-for="item in cates" :key="item.id" @tap="getPhotoListByCateId(item.id)">
							{{item.title}}
						</a>
					</div>
				</div>

		</div>

    <!-- 图片列表区域 -->
    <ul class="photo-list">
      <router-link v-for="item in list" :key="item.id" :to="'/home/photoinfo/'+item.id" tag="li">
        <img v-lazy="item.img_url">
        <div class="info">
          <h1 class="info-title">{{ item.title }}</h1>
          <div class="info-body">{{ item.zhaiyao }}</div>
        </div>
      </router-link>
    </ul>

  </div>

    

</template>
<script>
//1.导入 mui 的js文件
import mui from '../../lib/mui/js/mui.min.js'

export default {
  data() {
    return {
      cates: [],//所有分类的列表
      list: [] //图片列表的数组
    }
  },
  created() {
    this.getAllCategory();
    //默认进入页面,就主动请求 所有图片列表的数据
    this.getPhotoListByCateId(0)
  },
  mounted() {  
    //当组件中的DOM结构被渲染好并放到页面中后,会执行这个 钩子函数
    //如果要操作元素了,最好在mounted 里面,因为这个时候的 DOM 元素 是最新的
    //2.初始化scroll滑动控件
    mui('.mui-scroll-wrapper').scroll({
      deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
    });
  },
  methods: {
    getAllCategory(){
      //获取所有图片的分类
      this.$http.get('api/getimgcategory').then(result=>{
        if(result.body.status===0){
          //手动拼接出一个
          result.body.message.unshift({title:"全部",id:0});
          this.cates=result.body.message;
        }
      })
    },
    getPhotoListByCateId(cateId){
      //根据分类ID,获取图片列表
      this.$http.get('api/getimages/'+cateId).then(result=>{
        if(result.body.status===0){
          this.list=result.body.message;
        }
      })
    }
  },
}
</script>

<style lang="scss" scoped>
* {
    touch-action: pan-y;
  } 

.photo-list{
  list-style: none;
  margin: 0;
  padding: 10px;
  margin-bottom: 0;
  li{
    background-color: #ccc;
    text-align: center;
    margin-bottom: 10px;
    box-shadow: 0 0 9px #999;
    position: relative;
    img{
      width: 100%;
      vertical-align: middle;
    }
    img[lazy=loading] {
      width: 40px;
      height: 300px;
      margin: auto;
    }

    .info{
      color: white;
      text-align: left;
      position: absolute;
      bottom: 0;
      background-color: rgba(0,0,0,0.4);
      max-height: 84px;
      .info-title{
        font-size: 14px;
      }
      .info-body{
        font-size: 13px;
      }
    }
  }
}



</style>
